Could someone tell me

[fasteddie]

could someone tell me the diffrence between a promax and an optimax?
Thanks
Ed

 

[fishnfireman]

A LOT

Maybe someone who types faster than this one fingered pecker.........will jump in here..I dont have but a few minutes !-! [/b]

 

[fasteddie]

The short version will workfor me

 

[Lotus 50]

Pro max = hot version of conventional two stroke.
Solid mounts, a bit higher reving, hi per gearcase, lighter weight
Still has oil injection
Most are 225s, but there were Pro Max versions of the 150 and 200 for a while.

Optimax = direct injected
heavier, better fuel econony, reduced emissions vs conventional two stroke.
You can read more on the Mercury website about how wonderful it is (and I'm not being ironic)

 

[Speedman]

about 10-15 mph for the same HP!

 

[JR]

The early Optis had some expensive issues....

 

[whipper]

300 ProMax also. Optis are green clean and ProMax are race ready.

 

[silverbullet02]

Now that you have an opti, how do you like it?

 

[Freebird]

I considered both when I bought my 225PM, but I was told it would be a LOT less expensive to fix than the Opti when things go south.

 

[Jon]

When a few of us ran down the river at the rally (kind of quick), I maybe used half the fuel with my Opti vs all the PM's, and I kept up.

 

[Freebird]

When a few of us ran down the river at the rally (kind of quick), I maybe used half the fuel with my Opti vs all the PM's, and I kept up.

Half the fuel? I get about 4.5 MPG cruising at 50-55MPH (even turning a 24" prop), and I can only assume the hull on my old gal isn't as efficient as the 2003 variations. Maybe the PM's get thirstier by comparison in the upper RPM ranges, but I wouldn't think the percentages between the two would change that much.

 

[Jon]

Maybe not double then. I get 7+ up to about 65. The XS was originally developed as an endurance motor in the late 90's sometime.

 

[K-DAWG XB 2003]

The most obvious difference not listed.

Pro Max = 2.5 liter
Optimax = 3.0 liter

Completely different motors.

 

[whipper]

The most obvious difference not listed.

Pro Max = 2.5 liter
Optimax = 3.0 liter

Completely different motors.

Yes and the Optis are quieter also. i would love an opti on my GS.

 

[fasteddie]

Now that you have an opti, how do you like it?

The 175 is a 2.5L I love it all the running at the rally and I only used a little more than 26 gallons. With 29 SRX it is running low 80's, I got a 30 ET a couple of weeks ago I've seen upper 80's and I'm sure it'll bust 90 with good water.

 

[Jon]

What kind of speed do you get with your 200 ?

I've seen 87 with my 27 trophy when it was cooler out. I didn't test any other props then unfortunately. I think 89 is doable with my setup.